菜青虫主要为害甘蓝、花椰菜、白菜、萝卜等十字花科蔬菜,是蔬菜栽培上的一大害虫。主要以幼虫食叶为害,2龄前只能啃食叶肉,留下一层透明的表皮,3龄后可吞食整个叶片,影响植株生长发育和包心,造成减产。为有效地控制菜青虫的危害,笔者通过对数种农药混配组合进行了室内毒力测定 Cabbage caterpillars mainly for cabbage, broccoli, cabbage, radish and other cruciferous vegetables, is a major vegetable pests. Mainly larvae leaves damage, before the age of 2 can only chew on the leaf, leaving a layer of transparent epidermis, after 3 instar can swallow the entire leaf, affecting plant growth and heart, resulting in reduced production. In order to effectively control cabbage worm harm, the author through a few kinds of pesticides mixed with combinations of indoor toxicity determination